content: /**
   * Copyright (c) 2016-present, RxJava Contributors.
   *
   * Licensed under the Apache License, Version 2.0 (the "License"); you may not use this file except in
   * compliance with the License. You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software distributed under the License is
   * distributed on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See
   * the License for the specific language governing permissions and limitations under the License.
   */
  
  package io.reactivex.observable.internal.operators;
  
  import static org.junit.Assert.*;
  import static org.mockito.ArgumentMatchers.any;
  import static org.mockito.Mockito.*;
  
  import java.util.ArrayList;
  import java.util.concurrent.atomic.*;
  
  import org.junit.Test;
  
  import io.reactivex.common.functions.Consumer;
  import io.reactivex.observable.*;
  import io.reactivex.observable.extensions.QueueDisposable;
  import io.reactivex.observable.observers.*;
  
  public class ObservableRangeTest {
  
      @Test
      public void testRangeStartAt2Count3() {
          Observer<Integer> observer = TestHelper.mockObserver();
  
          Observable.range(2, 3).subscribe(observer);
  
          verify(observer, times(1)).onNext(2);
          verify(observer, times(1)).onNext(3);
          verify(observer, times(1)).onNext(4);
          verify(observer, never()).onNext(5);
          verify(observer, never()).onError(any(Throwable.class));
          verify(observer, times(1)).onComplete();
      }
  
      @Test
      public void testRangeUnsubscribe() {
          Observer<Integer> observer = TestHelper.mockObserver();
  
          final AtomicInteger count = new AtomicInteger();
  
          Observable.range(1, 1000).doOnNext(new Consumer<Integer>() {
              @Override
              public void accept(Integer t1) {
                  count.incrementAndGet();
              }
          })
          .take(3).subscribe(observer);
  
          verify(observer, times(1)).onNext(1);
          verify(observer, times(1)).onNext(2);
          verify(observer, times(1)).onNext(3);
          verify(observer, never()).onNext(4);
          verify(observer, never()).onError(any(Throwable.class));
          verify(observer, times(1)).onComplete();
          assertEquals(3, count.get());
      }
  
      @Test
      public void testRangeWithZero() {
          Observable.range(1, 0);
      }
  
      @Test
      public void testRangeWithOverflow2() {
          Observable.range(Integer.MAX_VALUE, 0);
      }
  
      @Test
      public void testRangeWithOverflow3() {
          Observable.range(1, Integer.MAX_VALUE);
      }
  
      @Test(expected = IllegalArgumentException.class)
      public void testRangeWithOverflow4() {
          Observable.range(2, Integer.MAX_VALUE);
      }
  
      @Test
      public void testRangeWithOverflow5() {
          assertFalse(Observable.range(Integer.MIN_VALUE, 0).blockingIterable().iterator().hasNext());
      }
  
      @Test
      public void testNoBackpressure() {
          ArrayList<Integer> list = new ArrayList<Integer>(Observable.bufferSize() * 2);
          for (int i = 1; i <= Observable.bufferSize() * 2 + 1; i++) {
              list.add(i);
          }
  
          Observable<Integer> o = Observable.range(1, list.size());
  
          TestObserver<Integer> ts = new TestObserver<Integer>();
  
          o.subscribe(ts);
  
          ts.assertValueSequence(list);
          ts.assertTerminated();
      }
  
      @Test
      public void testEmptyRangeSendsOnCompleteEagerlyWithRequestZero() {
          final AtomicBoolean completed = new AtomicBoolean(false);
          Observable.range(1, 0).subscribe(new DefaultObserver<Integer>() {
  
              @Override
              public void onStart() {
  //                request(0);
              }
  
              @Override
              public void onComplete() {
                  completed.set(true);
              }
  
              @Override
              public void onError(Throwable e) {
  
              }
  
              @Override
              public void onNext(Integer t) {
  
              }});
          assertTrue(completed.get());
      }
  
      @Test(timeout = 1000)
      public void testNearMaxValueWithoutBackpressure() {
          TestObserver<Integer> ts = new TestObserver<Integer>();
          Observable.range(Integer.MAX_VALUE - 1, 2).subscribe(ts);
  
          ts.assertComplete();
          ts.assertNoErrors();
          ts.assertValues(Integer.MAX_VALUE - 1, Integer.MAX_VALUE);
      }
  
      @Test
      public void negativeCount() {
          try {
              Observable.range(1, -1);
              fail("Should have thrown IllegalArgumentException");
          } catch (IllegalArgumentException ex) {
              assertEquals("count >= 0 required but it was -1", ex.getMessage());
          }
      }
  
      @Test
      public void requestWrongFusion() {
          TestObserver<Integer> to = ObserverFusion.newTest(QueueDisposable.ASYNC);
  
          Observable.range(1, 5)
          .subscribe(to);
  
          ObserverFusion.assertFusion(to, QueueDisposable.NONE)
          .assertResult(1, 2, 3, 4, 5);
      }
  }
  